This tutorial will show you how to create a program that can be called to terminate the existing program.

Reason To Use

As you may very well know, terminating using CTRL+T is an easy way to stop startup programs and for hackers to get into the rest of the programs on the computer. One way to stop that is to use the os.pullEvent = os.pullEventRaw in your code, but this could be a problem if you need to run the program for a test, and need to do maintenance on it! Here is a simple solution to your problem.


Here is the code. If you are on a single player world, you can just put this into any existing program by going to /.minecraft/saves/[worldname]/computer/[computernumber]/[programname] and editing it with notepad or notepad++. If you are doing this on a server, and you have access to the server's files, make a program, and go to /[serverdirectory]/[worldname]/computer/[computernumber]/[programname] and copy the code over it. Else, this will need to be typed directly into the console. Now onto the code.

Here is how you could lock the program:

-- Every safe protection locks the terminate key combo.
-- Just in case, we will keep what it used to be:
local old_pullEvent = os.pullEvent
-- And set it to the same as the one used for locking:
os.pullEvent = os.pullEventRaw
-- Right here is where you set the console input and password.
-- Some special keys don't work in ComputerCraft so be careful what you put in it.
local code = "terminate" -- This sets the required console input to: terminate
local password = "password" -- This sets the password to: password (the one in quotes)
-- We want to loop until the correct password is entered
while(true) do
  -- Clear the terminal screen
  -- Set the position of the next terminal output to the top left
  -- Send to the screen a prompt that gives a hint of what is going on
  write("Console: ") -- Purely optional but worth the effort
  -- Reads the input from the person at the computer
  local input = read()
  -- Check if they put in the correct info
  if input == code then
    -- Send to the screen a prompt that gives a hint that the password is needed
    write("Password: ")
    -- Read from the keyboard and show *s on the screen.
    -- Don't worry, it just hides it from prying eyes.
    local input2 = read("*")
    -- If they entered the correct password
    if input2 == password then
       -- End the loop
    -- If we get here, the password was wrong.
    print("Wrong password. Please try again.")
    -- Wait a bit so they see the previous line
    -- If we got here, the first prompt was given a wrong answer
    print("Unknown command. Please try again.")
    -- Wait a bit so they see the previous line
-- Once the code ends the loop with the ' break ' line, we end up here.
-- You can do three things from here:
--  1. End with nothing at the end,
--  2. Use ' error() ' (no 's of course) to go back to the terminal, or
--  3. Call a program after the correct password is entered.
-- If you do any of the above it is recommended to set
-- the os.pullEvent back to the way it was before doing so
-- unless you are wanting to not be able to use the
-- terminate feature for a run-away program you are testing.
-- (You set it to something, right?)
os.pullEvent = old_pullEvent

Start a Discussion Discussions about Tutorial/Code Protected Terminate Program

  • Coding Help

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    • I have my Simple password door code up, so i can have access to my door and have a password on it, and I have made a program called Overwatch t...
    • I can not see really well what you are asking. Can you upload your code for more clarity ? (tip, use Notepad++, you'll see it helps a lo...

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